Buffing or polishing machine



Get. 24, 1933. F. w LOVETT 1,931,500

BUFFING OR POLISHING MACHINE lllllllllllllllllllll Ill-lllllllllllllltllllllllillllllIllllllllllllllllllll II ll'lliIIIIIIHIIIIIQHIIIIlllllflmmlllllllll llllllllllllllllllill 1 u C Y 1) INVENTOR.

fiA/Yc/J MZOVZTI BY A TTORNEYS.

Filed Feb. 14, 1931 3 Sheets-Sheet l Oct. 24, 1933. w LQVETT 1,931,500

' BUFFING OR POLISHING MACHINE Filed Feb; 14, 1951 3 Sheets-Sheet 2 K WM 1 O 0 INVENTOR. fiA/rc/J h [wn'r ATTORNEYS.

Oct. 24, 1933. F. w. LOVETT BUFFING OR POgJISHING MCI-IINE 3 Sheets-Sheet 3 Filed Feb. vl4, 19:51

INVEN TOR. Z/ PMc/J Vim [r7 BY A TTORNEYS.

Patented ea. 24., 1933 7 1,931,500 sperms on POLISHING MACHINE Francis W. Lovett, Hatfield, Mass; assignor to Porter McLeod Machine Tool Co. Inc., Hatfield,

Mass, a corporation of Massachusetts Application February 14, 1921. Serial No. 515,739

Claims.

This invention relates to machines for buffing and polishing cutlery and the like. 7

It has for its object the provision of a device I of this character which shall be more ei'licient in operation than those previously used and capable of imparting a mirror-like finish to such metals as stainless steel. Y v

they and further objects will. become apparent from the following specification and claims.

trate one embodiment of this-invention:

Fig. 1 is a plan View; t Fig. 2 is a front elevation; V Fig. 3 is a section on line 33 of Fig. 4; Fig. 4 is a section on line 4'4 of Fig. 1; Fig. 5 is a side elevation, taken from'the left of Fig. 1;

Fig. 6 is a detail viewshowing the construction ofthe polishing rolls;

adjusting thepolishing rolls; Y 7

Fig. 8 is a detail plan view of the work holder, parts being broken away; and s Fig; 9 is an end elevation of the structure shown 1111 Fig. 8.

- Referring to the drawings,- the machine, in brief, comprises a casing 1 upon which are supported parallel, independentlydriven buffing or polishing rolls 2 and 3, and a slide 4 mounted for '36; reciprocation transverse to the rolls 2 and-3c A secondslide 6 which carriersthe work support 8 is mounted on slide 4 for reciprocation parallel to rolls2 and 3. The work support is preferably made adjustable on the slide 6 as shown. Means,

i1ater to be described, are provided for 'simultaneously reciprocating slides 4 and 6Qwiththe result that as thewcrk is moved back and forth in the bite of the rolls by the reciprocation of slide 4 they are also and with a greater frei olqu'ency moved sidewise by the reciprocation of slide 6. t

The shaft 10 of roll 2 is journaled in the free ends of arms 11 and 12 splined or otherwise secured to a rocker shaft 13mounted in upright Ibearing members 14 secured to thetop of casing 1 by bolts 15. Pads 19 of rubber or'other suitable material are interposed betweenmembers 14 andthe :casing' to eliminate vibration. -Arm 12; is extended, as best shown in Fig. 1-, to form a 5 1bracket 16 to which an'electric motor 171s s'ecured by bolts 18, the shaft of the motor forming an extension of, or being directly connected to, the shaft 10 of theroll. v I I s I similarly the shaft 20'of'rol1 3 is journaled in "-the free ends of arms 21 and 22 splined or other- In the accompanying drawings, which illus Fig. '7 is a detailview showing the means for" wise secured to a rocker shaft 23 mounted below shaft 13 in the bearing members 14. Arm 21 is extended to form a bracket 25 to which an electric motor 26 is secured by bolts 2'7, the shaft of motor 26 forming an extension of, or being directly connected to, shaft 20 of roll 3.

It will thus be seen that each roll 2 and 3 is independently driven by its motor and at full motor speed.

Shafts 13 and 23 are adapted to be simultaneously rocked in opposite directions by means of a turn buckle 29, the oppositely threaded endsof which engage in nuts 30 and 31 pivoted respectiveiy in the free ends of arms 32 and 33 which are splined respectively to shafts l3 and 23. As best shown in Fig. '7, shafts 13 and 23 are geared together as by segmental gears 34 and 35 respectively secured to said shafts so that rotation of turnbuckle 29 operates tosimultaneously rock shafts 13 and 23 in equal amounts but in'opposite directions, thus swinging rolls 2 and 3 toward or from each other'to adjust their spacing for work of different thickness at the same time keeping constant the central plane of the bite of the rolls, in which the work is moved by slides 4 and 6. Because of the geared connection of shafts l3 and 23, rolls 2 and 3 and their associated parts and motors tend to balance each other. Slide 4 is mounted for reciprocation on a dovetailed guide 36 (see Fig. 2) formed on the top of casing 1, and is provided with a pin 37 extending downwardly through a slot 38 into the casing. Slidefi is mountedfor reciprocation on a dovetailed guide 40 (see Fig. 5) formed on slide 4 and is provided at one end with a pin 41 extending 1 downwardly into the casing through an arcuate slot 42. H

The slides 4and 6 are driven from a horizontal shaft 44 journaled in bearings 45 and 46 (see Figs. 3 and 4) formed in the ends of casing 1. Shaft 44 is-driven from amotor 4'7, supported in the casing by a bracket 48, by means of a sprocket chain 49. v A worm 50 secured on shaft 44 meshes with a worm gear 51-secured to a vertical shaft 52 journaledin a thrust bearing 53 formed in a bottom web 54 and a bearing 55 formed in a bracket 56 projecting from the end of the casing.

'Vertical shaft 52 carries at its upper end a crank 1y from the top of the casing and its free end is connected to pin 37 of slide 4 by link 59. As will be clear from Fig. 3 and the foregoing description, adjustment of stub shaft 63 in slots 62 will vary the amplitude of the reciprocation imparted to pin 37 and slide 4 by rotation of crank 58 without changing its frequency or graduation.

Vertical shaft 52 is provided intermediate its ends with a large gear 67 which meshes with a small gear 68 secured to a vertical shaft 69 journaled in bracket 56. Vertical shaft 69 is provided on its upper end with a crank '70 connected by a link 71 to one end of a lever '72; Lever Z2 is pivoted intermediate its ends on stud '73 secured to the under side of the top plate of casing 1 and its other end is connected by a bent link 74 to pin 41 of slide 6.

It will thus be seen that while the slides are reciprocated simultaneously from horizontal shaft 44, the frequency of reciprocation of slide 6 (due to gearing 67-68) is several times that of slide 4. Furthermore, dueto the adverse leverage of lever '72, the amplitude of movement of slide 6 is substantially less than that of slide 4. The amplitude of the reciprocations of slides 4 and 6 are respectively indicated in Fig. S by double headed arrows a and b, and it will be noted that the stub shaft-63 is set to give very nearly the minimum travel to slide 4. i I

As shown in Figs. 2 and 3, horizontal web 54 is downwardly inclined forwardly and toward the center and with vertical webs '75 and 76 form an oil pan 77 which keeps shaft 44 and the gearing carried thereby constantly lubricated. A drain plug 78 is provided at the lowest point of web 54.. Preferably anti-friction bearings are used throughoutthe assembly.

The work support is carried by slide 6 and comprises vertical posts 80 adapted to receive work holding clamps such as shown at 81 (see Fig. 8). In the drawings, the clamp consists of a lower bar 82 provided with grooves 83 which the handle ends of knife blades 84 are somewhat loosely positioned onpins 85. An upper bar 86 loosely clamps the blade handles against the lower bar b y means of a wing nut 87, the articles having only enough freedom of movement so that they can contact uniformly with the rolls. The bars 82 and 86 are provided adjacent their ends with apertures 88 adapted to seat on the upper ends of posts 80.. Itwill be understood that the clamping bars 82 and 86 may take varying forms depending on the kind of workto be buffed or polishe d. As is obvious, by the arrangement shown the blades are simultaneously polished on both sides, but if desired an article may be mounted on the holder to contact with but one roll to polish or buff a single surface.

The polishing rolls 2 and 3 are formed of disks of felt 90 (see Fig. 6) spaced apart by fiber disks 91 of less diameter than disks 90, the disks 90 and 91 being held tightly together on the roll shaft by nuts 93'. v

By making the frequency of reciprocation of one slide greater than the other, the paths of reciprocation are made to shift with respect to each other, and if the frequencies are made other than a multiple of each other this shift varies with each ciprocations per minute, while 45 reciprocations per minute are imparted to slide 6, the path of reciprocation of slide 6 shifts constantly back and j forthlengthwise of the rolls in a path generally tating rolls 2 and 3 by the reciprocation of slide 4, which reciprocation may be adjusted to the len th of the work, and that simultaneously a constantly shifting, short, quick reciprocation parallel to the rolls is imparted to the work by slide 6. Turnbuckle 29 permits a nice adjustment of the bite of the polishing rolls and the pressure exerted on the work by the felt disks.

The invention is not limited, of course, to double roll machines but may, if desired, be applied to devices having a single roll or other type of buffer.

What I claim is:

l. A bufling and polishing machine which comprises a casing, a pair of rolls mounted therein, an electric motor connected to the shaft of each roll to drive it independently of the other, means to simultaneously move the rolls toward and from each other to adjust their spacing to various thicknesses of work, a slide mounted on 105 said casing for reciprocations in directions transverse to the axes of the rolls, a second slide mounted thereon for reciprocations in directions parallel to the axes of the rolls, a work support carried by the second slide, a horizontal shaft 119 positioned within the casing, means to drive said shaft, a vertical shaft geared to the horizontal shaft, a crank secured to the vertical shaft and operatively connected to the first slide, said connection being adjustable to vary the amplitude of the reciprocation imparted to the slideby said crank, a second vertical shaft, gearing connect. ing said vertical shafts and adapted to drive the second shaft at a greater or less speed than the first shaft, and a crank secured to the second 120 shaft and operatively connected to the second slide.

2. A bulnng and polishing machine which comprises a pair of buffing and polishing rolls of greater length than the width of the work pieces to be polished, means to drive said rolls, a slide mounted for reciprocations in directions transverse to the axes of the rolls, a second slide. mounted on the first slide for reciprocations in directions parallel to the axes of the rolls, a work'1-3o support carried by the second slide, means to repeatedly reciprocate'the first named slide to pass the work back and forth through the bite of the polishing rolls and means to simultaneously and repeatedly-reciprocate the second named slide to move the work to and fro sidewise in the bite of the rolls with a frequency greater than and other than an integral multiple of the frequency of reciprocation of the first named slide.

3. A hurling and polishing machine which comprises a pair of buffing and polishing rolls of greater length: than the Width of the work pieces-to be polished, means to drive said rolls, a slide mounted for reciprocationsin directions transverse to the axes of-the rolls, a second slide mounted on the first slide for reciprocation in directions parallel to the. axes of the rolls, a. work support carried by the second slide, means to repeatedly reciprocate the first namedsliole to pass the workback and forth through the 150 kill bite of the polishing rolls and means to simultaneously and repeatedly reciprocate the second named'slide to move the work to and fro sidewise in the bite of the rolls, the path of each successive to and fro reciprocation being longitudinally and laterally offset from the one immediately preceding, the relative frequencies of the reciprocations imparted to said slides being such as to cause the said offset paths to follow a different course for each of a succeeding series of half reciprocation of the first named slide.

4. A bufling and polishing machine which comprises a pair of bufiing and polishing rolls, a slide mounted for reciprocations in directions transverse to the axes of the rolls, a second slide mounted on the first slide for reciprocations in directions parallel to the axes of the rolls, a work support carried by the second slide, means to repeatedly reciprocate the first slide to pass the work pieces back and forth through the bite of the rolls, means to adjust the amplitude of the reciprocations imparted to the first slide, Without changing the frequency of the reciprocations, to thereby accommodate work pieces of different length, means to simultaneously and repeatedly reciprocate the second slide to move the work to and fro sidewise in the bite of the rolls, with a frequency greater than the frequency of reciprocation of the first named slide. 5. A buifing and polishing machine which comprises a casing, a pair of bufiing and polishing rolls of greater length than the width of the work pieces to be polished, a slide mounted on said casing for reciprocations in directions transverse to the axes of the rolls, a second slide mounted on the first slide for reciprocations parallel to the axes of the rolls, a work support carried by the second slide, a horizontal shaft positioned within the casing, means to drive said shaft, a vertical shaft geared to the horizontal shaft, a crank secured to the vertical shaft and operatively connected to the first slide, said connection being adjustable to vary the amplitude .of the reciprocation imparted to the slide by said crank, a second vertical shaft, gearing directions transverse to the axes of the rolls, a.

second slide mounted on the first slide for reciprocations in directions transverse to the direction of the movement of the first slide, a work support carried by the first slide, means to reciprocate the first slide to repeatedly pass the work back and forth through the bite of the rolls and means to simultaneously and repeatedly reciprocate the second slide to move the Work to and fro sidewise in the bite of the rolls and means to adjust the amplitude of the reciprocations of the first slide Without changing the relation between the frequencies of the reciprocations of the two slides.

FRANCIS W. LOVETT 

